RED LIST Biotope Expert Team
Baltic aphotic bottoms with at least 90 % coverage
of muddy sediment. The sediment must contain at least 20 % of mud, silt or
clay (grain size less than 63 µm). Sessile/semi-sessile epibenthic macrofauna
is not present. Biomass of infaunal insect larvae dominates and in the highest in
the group that includes infaunal bivalves/polychaetes/crustaceans/echinoderms/insect.
Substrate is muddy sediment. Depth below approximately 20 m. Appears
in all energy exposure classes.
Diversity, abundance and biomass of fauna.
Whole Baltic Sea
2.7 Muddy bottoms
A5 Sublittoral sediment
A5.3 Sublittoral mud
A5.37 Deep circalittoral mud
A5.378 Baltic muddy bottoms of the aphotic zone
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HELCOM HUB: Technical Report on the HELCOM Underwater Biotope and habitat classification BSEP 139